In one of the most mediocre movies so far this year, “Bloodshot” squanders every last positive thing it has going for it. Based on the bestselling sci-fi comic book, the film tells the story of recently killed soldier Ray Garrison (Vin Diesel) who is brought back to life as a super-assassin. Ray has an army of nanotechnology in his veins, making him an outrageously strong, unstoppable force who has the ability to instantly heal any injuries he sustains in combat. When his memories begin to contradict what’s reality and what’s fiction, Ray starts to suspect lead scientist Dr. Harting (Guy Pearc...